/*
 * RGB Gradient
 * By: Luis Alejandro Domínguez Bueno
 * On: 2024/02/19
 */

//const byte = ledPins[] = {15, 2, 4};
const byte ledPins[] = {12, 14, 27};
const byte pwmChannels[] = {0, 1, 2};
int red, green, blue;

void setup() {
  for (int i = 0; i < 3; i++) {
    ledcSetup(pwmChannels[i], 1000, 8);
    ledcAttachPin(ledPins[i], pwmChannels[i]);
  }
}

void loop() {
  for (int i = 0; i < 256; i++) {
    setColor(wheel(i));
    delay(20);
  }
}

void setColor(long rgb) {
  ledcWrite(pwmChannels[0], 255 - (rgb >> 16) & 0xFF);
  ledcWrite(pwmChannels[1], 255 - (rgb >> 8) & 0xFF);
  ledcWrite(pwmChannels[2], 255 - rgb & 0xFF);
}

long wheel(int pos) {
  long wheelPos = pos % 0xFF;

  if (wheelPos < 85) {
    return ((255 - wheelPos * 3) << 16) | ((wheelPos * 3) << 8);
  } else if (wheelPos < 170) {
    wheelPos -= 85;

    return ((255 - wheelPos * 3) << 8) | (wheelPos * 3);
  } else {
    wheelPos -=170;

    return ((wheelPos * 3) << 16 | (255 - wheelPos * 3));
  }
}